Mail Call Amazing Spider-Man 31! Finally pulled the trigger on a grail for mine. It's a double key--First Gwen Stacy and First Harry Osborn! : r/comicbookcollecting
The Amazing Spider-Man (1963) #31 | Comic Issues | Marvel
Steve Ditko - Amazing Spider-Man #31, p. 8 (Marvel, 1965), in Gene P's Ditko, Steve (Amazing Spider-Man) Comic Art Gallery Room
Marvel Digital Comics — Amazing Spider-Man (1963) #31 - VeVe Digital Collectibles